$ mount | grep huge hugetlbfs on /dev/hugepages type hugetlbfs (rw,relatime,mode=1770,gid=78) Make sure /dev/hugepages is mounted properly: The mode of 1770 allows anyone in the group to create files but not unlink or rename each other's files. Instead of specifying the group name directly, with gid=kvm, you can of course specify the gid as a number, but it must match the kvm group. etc/fstab hugetlbfs /dev/hugepages hugetlbfs mode=01770,gid=kvm 0 0 The default permission is root's uid and gid with 0755, but we want anyone in the kvm group to have access to hugepages. Now we need the right permissions to use this directory. Check if you have the directory /dev/hugepages. With an up to date Arch Linux and a running KVM, you probably already have everything you need. You may also want to enable hugepages to improve the performance of your virtual machine. After the above issue is cleared, I suggest merging this section into QEMU. In case the above commands return nothing, you need to load the kernel modules manually. Then, check if the kernel modules are automatically loaded with the command: Use the following command to check if the VIRTIO modules are available in the kernel inside the virtual machine: KVM provides para-virtualized devices to virtual machines using the Virtio API as a layer between the hypervisor and guest.Īll Virtio devices have two parts: the host device and the guest driver. Para-virtualization provides a fast and efficient means of communication for guests to use devices on the host machine. To determine whether there is no hardware support or whether the extensions are disabled in BIOS, the output from dmesg after having failed to modprobe will tell. Some vendors, especially laptop vendors, disable these processor extensions by default. Tip: If modprobing kvm_intel or kvm_amd fails but modprobing kvm succeeds, and lscpu claims that hardware acceleration is supported, check the BIOS settings. If nothing is displayed after running either command, then your processor does not support hardware virtualization, and you will not be able to use KVM. $ grep -E -color=auto 'vmx|svm|0xc0f' /proc/cpuinfo You can check whether your processor supports hardware virtualization with the following command: KVM requires that the virtual machine host's processor has virtualization support (named VT-x for Intel processors and AMD-V for AMD processors). You should see related articles for such information.Ĭhecking support for KVM Hardware support This article does not cover features common to multiple emulators using KVM as a backend. (See Guest Support Status for more information.) Each virtual machine has private virtualized hardware: a network card, disk, graphics card, etc.ĭifferences between KVM and Xen, VMware, or QEMU can be found at the KVM FAQ. Using KVM, one can run multiple virtual machines running unmodified GNU/Linux, Windows, or any other operating system. Unlike native QEMU, which uses emulation, KVM is a special operating mode of QEMU that uses CPU extensions ( HVM) for virtualization via a kernel module. It is similar to Xen in purpose but much simpler to get running. KVM, Kernel-based Virtual Machine, is a hypervisor built into the Linux kernel.
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